The IDAE is a public entity of the Ministry of Industry and Energy which belongs to the Department of Energy and Mineral Resources. Its objective is to improve energy efficiency in the use of energy in the different consumer sectors and to promote production and consumption of renewable energies. The work of the IDAE in the different consumer sectors is derived from action planned in the Energy Saving and Efficiency Plan (ESEP) of the National Energy Plan 91/2000 and from strategies identified in the New Promotion of Spain＇s Energy Saving Policy, which includes thinking ahead to promote activities so that consumer sectors will be able to avoid having to take costly corrective measures - where feasible - in the future. The activities to promote energy efficiency are therefore of particular interest in the new desalination sector which is already working on a large scale in Spain.